Cheapest return flights from Ontario to Las Vegas in May from $111

AirHint found the following cheapest return flights from Ontario (ONT) to Las Vegas (LAS) in May 2026 (see full year).

Return flights

12 May - 13 May Frontier Airlines direct
07 May - 10 May Frontier Airlines direct
01 May - 04 May Frontier Airlines direct
09 May - 11 May Frontier Airlines direct
06 May - 07 May Frontier Airlines direct
15 May - 18 May Frontier Airlines direct
15 May - 19 May Frontier Airlines direct
08 May - 10 May Frontier Airlines direct
15 May - 17 May Frontier Airlines direct
13 May - 20 May Southwest Airlines direct
27 May - 03 Jun Southwest Airlines
25 May - 01 Jun Southwest Airlines
28 May - 04 Jun Southwest Airlines
31 May - 05 Jun Southwest Airlines

Also check the deals for one-way flights from Ontario to Las Vegas in May.

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